Mercury-mercurous propionate electrode: standard potentials at different temperatures and related thermodynamic quantities
TL;DR: In this paper, the standard molal potentials of the OPr − electrode at 15°, 20°, 25°, 30° and 35° C were determined, which can be fitted to the equation E dg m /V = 0.5031 −8.
Abstract: The standard molal potentials E° m of the Hg/Hg 2 (OPr) 2 , OPr − electrode at 15°, 20°, 25°, 30° and 35° C have been determined. The E ° m values obtained are 0.5114, 0.5072, 0.5031, 0.4988 and 0.4942 V respectively, which can be fitted to the equation E dg m /V = 0.5031 −8.56 × 10 −4 (itt/°C − 25)−3.0588 × 10 −6 ( t / °C -25) 2 . The changes in standard free energy, entropy and enthalpy for the cell reaction have been calculated.
TL;DR: In this article, the standard molal potentials of the Hg/Hg2(OPr)2, OPr− electrode at 15, 20, 25, 30 and 35°C have been determined in dioxan-water media.
Abstract: The standard molal potentials (E°m/V) of the Hg/Hg2(OPr)2, OPr− electrode at 15, 20, 25, 30 and 35°C have been determined in dioxan-water media. The values of E°m as a function of the Celsius temperature, t, in different solvent composition may be represented by the following equations: The related thermodynamic quantities have been calculated. The dependence of the standard potentials at 25°C on the dielectric constant of the media (in the light of the Born equation), the volume fraction (Φw) and the mole fraction (Nw) of water (based on Feakins-French relationship) have been examined. The variation of the thermodynamic quantities ΔG°, ΔS° and ΔH° with various parameters associated with solvent media have also been examined. The observations are similar to those reported in our previous work on mercury-mercurous acetate electrode in the same media. ΔC°p for the cell reaction has been calculated.